<!DOCTYPE html>
<html lang="en" xmlns="http://www.w3.org/1999/html">
<head>
    <meta charset="UTF-8">
    <title>画正方体</title>
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <style>
        .cube {
            font-size: 4em;
            width: 2em;
            margin: 1.5em auto;
            transform-style: preserve-3d;
            transform: rotateX(-35deg) rotateY(30deg);
        }

        .side {
            position: absolute;
            width: 2em;
            height: 2em;
            background: rgba(255, 99, 71, 0.6);
            border: 1px solid rgba(0, 0, 0, 0.5);
            color: white;
            text-align: center;
            line-height: 2em;
        }

        .front {
            transform: translateZ(1em);
        }

        .bottom {
            transform: rotateX(-90deg) translateZ(1em);
        }

        .top {
            transform: rotateX(90deg) translateZ(1em);
        }

        .left {
            transform: rotateY(-90deg) translateZ(1em);
        }

        .right {
            transform: rotateY(90deg) translateZ(1em);
        }

        .back {
            transform: translateZ(-1em);
        }
    </style>
</head>
<body>
<div class="cube">
    <div class="side front">1</div>
    <div class="side back">6</div>
    <div class="side right">4</div>
    <div class="side left">3</div>
    <div class="side top">5</div>
    <div class="side bottom">2</div>
</div>
</body>
</html>